Navigational signal tracking in low power mode

Details Navigational signal tracking in low power mode Navigational signal tracking in low power mode

2006-12-22

2010-12-07

Tarcza, Thomas H (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

Reexamination Certificate

active

07847726

ABSTRACT:
The present invention provides systems and methods for navigational signal tracking in low power mode to conserve the power of handheld navigation receivers. In an embodiment, the receiver cycles between sleep and wakeup states. During the sleep state, most of the components of the receiver are powered off to conserve power, and during the wakeup state, the receiver tracks navigational signals. In an embodiment, the duty cycle of the sleep/wakeup states depends on the receiver dynamic state, e.g., whether the receiver is accelerating. In another embodiment, during the wakeup state, the receiver selects a tracking mode based on the signal strength. Under weak signal conditions, a tracking mode using a long integration to track the satellite signal is disclosed. In one embodiment, a tracking mode tracks the navigation signal by performing data aided integration using known or predicted data bits, such as the TLM and HOW words.

REFERENCES:
patent: 5592173 (1997-01-01), Lau et al.
patent: 6252545 (2001-06-01), Bernards
patent: 6611756 (2003-08-01), Chen
patent: 6731701 (2004-05-01), Vorobiev
patent: 6775802 (2004-08-01), Gaal
patent: 6965760 (2005-11-01), Chen
patent: 2007/0268180 (2007-11-01), Zhi et al.

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